{
"id": "GHSA-5p3x-r448-pc62",
"aliases": [
"CVE-2021-21239"
],
"details": "### Impact\n\nAll users of pysaml2 that use the default `CryptoBackendXmlSec1` backend and need to verify signed SAML documents are impacted. `pysaml2 <= 6.4.1` does not ensure that a signed SAML document is correctly signed. The default `CryptoBackendXmlSec1` backend is using the `xmlsec1` binary to verify the signature of signed SAML documents, but by default, `xmlsec1` accepts any type of key found within the given document. `xmlsec1` needs to be configured explicitly to only use only _x509 certificates_ for the verification process of the SAML document signature.\n\n### Patches\n\nUsers should upgrade to pysaml2 `v6.5.0`.\n\n### Workarounds\n\nNo workaround provided at this point.\n\n### References\n\nThis issue has been reported in the past at the xmlsec1 mailing list:\nhttps://www.aleksey.com/pipermail/xmlsec/2013/009717.html\n\n### Credits\n\n- Brian Wolff\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open an issue in [pysaml2](https://github.com/IdentityPython/pysaml2)\n* Email us at [the incident-response address](mailto:[email protected] )\n",
"summary": "Improper Verification of Cryptographic Signature in PySAML2",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "6.5.0"
}
]
}
],
"package": {
"name": "pysaml2",
"ecosystem": "PyPI"
}
}
],
"modified": "2024-10-14T15:41:51Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
}
],
"published": "2021-01-21T14:12:18Z",
"references": [
{
"url": "https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-5p3x-r448-pc62",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21239",
"type": "ADVISORY"
},
{
"url": "https://github.com/IdentityPython/pysaml2/commit/46578df0695269a16f1c94171f1429873f90ed99",
"type": "WEB"
},
{
"url": "https://github.com/IdentityPython/pysaml2",
"type": "PACKAGE"
},
{
"url": "https://github.com/IdentityPython/pysaml2/releases/tag/v6.5.0",
"type": "WEB"
},
{
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/pysaml2/PYSEC-2021-49.yaml",
"type": "WEB"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2021/02/msg00038.html",
"type": "WEB"
},
{
"url": "https://pypi.org/project/pysaml2",
"type": "WEB"
},
{
"url": "https://www.aleksey.com/pipermail/xmlsec/2013/009717.html",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-347"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": "2021-01-21T15:15:00Z",
"github_reviewed_at": "2021-01-21T14:11:58Z"
}
}